Machine foe bending blanks into tubular form



' (No Model.)

, 2 Sheets-Shed 1 r D. S. HALL. MAGHINBPOR BBNDING BLANKS INTO TUBULAR FORM.

N9. 389,107. Patented Mar. 2'7, 1888.

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' (No Model.)

D. s. HALL.

MACHINE FORBENDING BLANKSINTO TUBULAR FORM. No..380,10'7.

Patented Mar. 2'7, 18 88-,

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DAVID S. HALL, OF STOUGHTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO GEORGE F. WALKER, OF SAME PLACE.

MACHINE FOR BENDING BLAN KJS INTO TUBULAR FORM.

SPECIFICATION forming part of Letters Patent No. 380.107, dated March 27, 1888.

I Application filed September 10, 1887. Serial No. 249,323. (No model.)

To all whom it may concern:

Be it known that I, DAVID S. HALL, of Stoughton, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Machinesfor Bending Sheet Metal Blanks into Tubular Form, of which the following isaspecification.

This invention has for its objectto provide a simple machine for bending flat sheet-metal strips or blanks into tubes adapted to bush or line the jack-spindle sockets of boot or shoe lasts, and for other purposes.

The invention consists in the combination of parts, which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a front elevation of my improved machine. Fig. 2 represents an end elevation of the same. Figs. 3, 4:, and 5 represent detached views showing the different stages of the operation.-

The same letters of reference indicatethe same parts in all the figures.

In the drawings, a represents the supporting-base of the machine, and b b represent two vertical standards rigidly affixed to the base.

0 represents a platen adapted to slide on the standards b b, the platen havingsockets through which the standards pass. On said platen is a concave die, 6, the acting face of which is substantially semicircular. The platen e and die e are raised and lowered on the standards b b by suitable mechanism. I 'have here shown two toggle-joints, ff, the links of which are pivoted at their meeting ends to a rod, 9, and at their outer ends to the base a and platen c.

A rod, it, connected atone end to a powerdriven eccentric and at the other end to the rod gives the rod 9 a lateral reciprocating motion, which alternately raises and lowers the platen c. 1

The driving mechanism should have a suitable stop-motion, whereby after the platen has been once raised and depressed the operation of the machine will cease until the operator depresses a foot-lever, or otherwise starts the machine. Any other suitable operating mechanism may be employed than that shown for raising anddepressing the platen and its die e.

i represents a bar or plate suitably affixed to the standards b b, preferably by nuts k screwed upon threaded portions of said standards, whereby the bar j can be vertically adjusted and fixed rigidly'in any position to which it may be adjusted, said bar being immovable when the machine is in operation. To the under side of the bar j is aifixed a die,

11, the acting face of which is concave, butis considerably wider than that of the die e.

m represents a horizontal mandrel which isthe supporting-frame n n, so that the mandrel yields to the upward movement of the platen c, as hereinafter described. r

The operation of the machine is as follows:

The platen a being at its lowest point and at rest, a flat strip or blank of sheet metal of suitable size is placed on the die e, as shown in Figs. 1 and 3, the mandrel at being above said strip. The machine is then set in operation and the platen is raised and caused to press the blank against the mandrel m. The spring Zis sufficiently stiff to hold the mandrel against the upward pressure until the mandrel has bent the blank into U'shape, as shown inFig. 4, after which the mandrel yields and moves upwardly with the die 6 until the ends of the U- shaped blank enter and are bent inwardly by the die '13, as shown in Fig. 5, the tube being thus completed. The platen c is then depressed and the operation of the machine is stopped, while the tube is removed from the mandrel and a new blank is placedon the die e, after which the operation is repeated, as described. l I

It will be seen that the yielding mandrel enables the bending operation to be performed by the movement of but one of the dies, instead of by the movement of both, as would be necessary if the mandrel were not adapted to yield. The machineis therefore much cheaper and simpler in construction than machines of this class heretofore made.

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mandrel, the die 2', and devices, substantially as described, whereby said die may be verr5 tically adjusted and positively held at any position to which it may be adj ustcd, as set forth.

In testimony whereof I have signed my name to this specification, in the presence oftwo subscribing witnesses, this 23d day of August, A. 20 D. 1887.

DAVID S. HALL.

Witnesses:

FRANCES B. HALL, ANNIE G. MCCORMICK. 

